Just Crack Interview

Electrical interview questions – page 19

1,095 questions. Tap “Show answer” to check yourself.

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  1. Is 3-phase induction motor need a starter ? why do it so

  2. How to calibrate transmitter

  3. Which type of gas used in cylinder (VCB)?????

  4. What is Nominal voltage?

  5. Why is starter necessary for a three-phase induction motor?

  6. What are the two types of noise of MOSFET, how to eliminatethem?(Thermal and Flicker).

  7. What is cogging and crawling

  8. Why all voltage level are multiples of 11, like 220V, 440V, 1100V instead of 200V, 400V, 1000V?

  9. Can we test the alignment of End shield and stator ofturbogenerator without rotor insertion? Also how to fixmaintain the alignment at site installation?

  10. If a fan get trip and run in reverse direction due to system flow. Now in this condition during starting how can a VFD bring this negative speed to zero and later run in forward direction?

  11. How to improve IR value in HT motors?

  12. How a three wire proximity can be used in place of two wire proximity?

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  14. What is difference between differential protection and distance protection and how we calculate the sloop?

  15. In VVVF DRIVES VOLTAGE IS ALSO VARY WITH THE FREQUENCY. HOW? WHAT IS THE DIRECT FORMULA RELATING THESE TWO.

  16. Can we use existing delta star with neutral grounded,stepdown(6.6kV/415V), 3 phase power transformer bi-directionally.

  17. In dc shunt generator field is open in running condition what will happen?

  18. How to estimate the breaker capacity of breaker,please give the one example( 6.6 kv breaker,800a)?????

  19. WHY THE SYNCHRORONOUS MOTOR IS NOT SELF STARTING, AND WHY THE STATOR AND ROTOR IS COUPLED?

  20. How many earthing should give for transformer body and nuetral

  21. If transformer winding burn on dc supply then why not alternator rotor winding

  22. PID controller is used for which type of compensation??a) lead comp. b) lag com. c) lead lag com.

  23. What is Metering theory?

  24. When we give supply to a transformer 11 kv and we get 415v from it, so when we give supply to same transformer 415v on ht side what we get?and When we gives supply to any transformer to L.T. side 415v or 220v What supply is on H.T. side?

  25. How to check the insulation for motor using megger?

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  27. What is earthed and inearthed cable or system?

  28. What is negative range in transmeter?

  29. Why only three phase power generation are load are used

  30. What is the difference between arc and spark

  31. What is thermal relay and how it is works in transformer please explain

  32. Why we choose 400kv,220kv,132kv,66kv,33kv transmission voltages for transmitting power. Why not other voltage levels.

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